Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof; and,

FIG. 5 is a fifth image thereof.

The broken lines in the figures depict portions of the transitional graphical user interface that form no part of the claimed design.

The outermost broken line showing of the display screen or portion thereof is for environmental purposes only and forms no part of the claimed design.

The appearance of the transitional graphical user interface sequentially transitions between the images shown in FIGS. 1 through 5. The process or period in which one image transitions to another forms no part of the claimed design.

The grayscale tones used to depict the transitional graphical user interface in the drawings illustrate contrasting appearance. 

CLAIM We claim the ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 